Only a small number of printing types from the 15th century survive, including a group found in the mud of a Lyon riverbank in 1868. https://specialcollections.princeton.edu/2023/08/early-printing-types-lyons-ca-1473-1500/
My uncle was a printer; one of the last generation to assemble print jobs from type like this.
His super-power was to be able to read mirror writing at full speed, even upside-down.